From: Comprehensive evaluation of root and root canal morphology of mandibular second molars in a Saudi subpopulation evaluated by cone-beam computed tomography
1-2-3-2
3-2-1
3-2
2-3-2-1
Male
1 (0.3)
1 ( 0.3)
0 (0.0)
Female
2 (0.7)
Total